/**
 * Persistent status line spinner.
 *
 * Shows an animated spinner on the last line of the terminal.
 * Regular output scrolls above it. Intercepts both stdout and stderr
 * writes to clear and redraw the spinner around each write.
 */
interface StatusLineOptions {
    readonly renderImmediately?: boolean;
    readonly dim?: boolean;
    readonly intervalMs?: number;
    readonly truncate?: boolean;
}
declare class StatusLineImpl {
    private active;
    private message;
    private frame;
    private intervalId?;
    private rawStdoutWrite?;
    private savedStdoutWrite?;
    private savedStderrWrite?;
    private rendering;
    private spinnerRendered;
    private outputLineOpen;
    private options;
    private suspendedStatus?;
    private suspendDepth;
    /** Progress feedback must not corrupt streamed text or leak into redirected output. */
    start(message: string, options?: StatusLineOptions): void;
    update(message: string): void;
    /** Readline can erase an unfinished body when its prompt begins on that body's line. */
    suspend(): void;
    /** Nested prompt helpers may still own the terminal when an inner helper finishes. */
    resume(): void;
    /** Later tasks must not inherit terminal ownership or pending progress from an earlier task. */
    stop(): void;
    /** Timer ticks can occur between text chunks, where a carriage return would overwrite user text. */
    private render;
    /** A newline-free body may occupy the final line even after task completion. */
    private clearSpinner;
}
export declare const statusLine: StatusLineImpl;
export {};
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